Question

Choose the ODD one out of the following terms given and name the CATEGORY to which the others belong:
Aqueous humour, Vitreous humour, Iris, Central canal.

Answer 1

(i) Aqueous humour - A transparent, watery fluid secreted into the space between the lens and the cornea (anterior and posterior chambers) by the ciliary glands.

(ii) Vitreous humour - A colourless, transparent, jelly-like substance that fills the space between the lens and the retina of the eyeball.

(iii) Iris is the visible coloured ring at the front of the eye and extends anteriorly from the ciliary body, lying behind the cornea and in front of the lens.

(iv) The central canal is a cerebrospinal fluid-filled space which runs through the entire length of the spinal cord.

Aqueous humour, Vitreous humour and Iris are found in the eye whereas central canal is not present in the eye.

Hence, The answer is Central Canal.